These OS FINDER I DISPOSABLE Cervical Dilators are especially useful in locating and dilating the external OS, the cervical canal and the internal OS. They are particularly valuable instruments to be used on post-menopausal patients with cervical stenosis. BLUE COLOR FDA-GMP Compliant ISO 13485 Certified CE Mark. Length: 215 mm, Taper: 23 mm (1.75 mm Tip to 3.8 mm OD). 25/BX. Price per box.